The water content in human body is:

1. 70%
2. 75%
3. 80%
4. 90%

The purest form of natural water is:

1. sea water
2. river water
3. rain water
4. lake water

Water is a:

1. compound
2. element
3. mixture
4. none of the above

Which of the following is a source of underground water?

1. Rivers
2. Lakes
3. Ponds
4. Springs